WASHINGTON -- Voters from coast to coast were poised to deliver a heavy blow Tuesday to President Barack Obama's Democrats in elections likely to cost the party control of at least one chamber of Congress. Just two years after Obama swept into office on a promise of hope and change, voters discouraged by the dismal U.S. economy were expected to hand Republicans control of the House of Representatives. Republicans were also expected to make gains in the Senate, with an outside shot at capturing the upper chamber. In the campaign's final hours, Democrats and Republicans pressed their supporters to vote, especially in states with toss-up Senate contests, such as Pennsylvania, Nevada, Illinois, Colorado and Washington state. "We're hoping now for a fresh start with the American people," said Republican National Committee chairman Michael Steele. A big Republican win would derail Obama's agenda in the last two years of his term, potentially leaving Washington in political gridlock unless the president can find common ground with some of his fiercest critics. Domestic issues such as Obama's tax and spending plans would be most affected, but the repercussions would be felt internationally too, on issues such as climate change, trade and arms control. Obama was home from the campaign trail at the White House after a weekend rush through four states. The president traveled to 14 states in the final month of the campaign, some of them twice, in a bid to rekindle the enthusiasm of young voters, liberals, blacks and independents whose ballots propelled him to the White House. The vote will shape American politics as Obama looks toward running for re-election in 2012 and Republicans begin the process of selecting a candidate to oppose him. Changes at the top of Congress are likely. If Republicans gain the 40 seats needed to win the 435-member House, Rep. John Boehner of Ohio would replace Nancy Pelosi as speaker, making him second in line to the presidency. Even if Republicans fail to pick up the 10 seats they need to win the 100-seat Senate, Democrats may need a new majority leader. Sen. Harry Reid faces a tough challenge from Sharron Angle in Nevada. Angle is a favorite of the ultraconservative tea party movement that has jolted American politics with its call for a drastically smaller government and lower taxes. Polls have shown Republicans to be more enthusiastic than Democrats about casting ballots. In Nevada, final tallies for two weeks of in-person voting and a preliminary count of mail-in ballots for the state's two most populous counties, Clark and Washoe, showed Republicans outperforming Democrats in getting a higher percentage of their voters to the polls, even though Democrats had a 9,000-voter edge in ballots cast. Beyond the congressional votes, Republicans are expected to score big gains in 37 gubernatorial elections and in votes for state legislatures. Those races are important as states redraw congressional districts following the 10-year census. America's political environment has changed drastically since 2008, when Democrats expanded their majorities in both chambers, riding on voters' economic anxiety, their weariness with George W. Bush's presidency and Obama's popularity. Some wondered if Republicans would need decades to recover. But the anti-incumbent mood and economic worries didn't go away and, with Democrats now controlling the White House as well as Congress, public anger is directed at them. The amorphous tea party movement has been the clearest voice of that rage, energizing Republicans even as it has toppled some party veterans. Republicans have also benefited from changes in political spending regulations stemming from a Supreme Court ruling that made it easier for corporations, unions and other groups to spend money on elections. Democrats say they inherited an economy in dire condition and managed to prevent a financial breakdown and the collapse of the U.S. auto industry. But they find it hard winning elections by arguing that things could have been worse. Obama's signature achievement -- a massive health care overhaul -- has not helped his party. Liberals criticize it as too meek and conservatives as too expensive and intrusive. Democrats have also been hurt by Obama's declining popularity. While he was once lauded as dynamic and inspirational, he is now criticized as overly academic and aloof. Republican candidates look to tie their rivals to Obama while some Democrats tried to distance themselves from him. "This election is entirely about him and this big majority in Congress and what they've been doing for the last two years," Senate Republican Leader Mitch McConnell said in an interview with The Associated Press. Among the Senate seats that Democrats could lose is the one in Illinois formerly held by Obama. A win there by Republican Mark Kirk over Democrat Alexi Giannoulias would have huge symbolic importance to Republicans and greatly improve their prospects for capturing the Senate. Besides winning Illinois and Reid's seat in Nevada, Republicans probably need to capture seats now held by Democrats in Pennsylvania, Washington state and Colorado to have a shot at controlling the Senate. Less likely, but still possible, is a Republican win in California, where veteran liberal Sen. Barbara Boxer faces former Hewlett-Packard chief executive Carly Fiorina. The Democrats' best chance of capturing a Republican Senate seat may be in Alaska, where the Republican vote could be split. Joe Miller, a tea party favorite supported by former Alaska Gov. Sarah Palin, won the party nomination from the incumbent, Lisa Murkowski. But Murkowski has stayed in the race as a write-in candidate, creating an opening for Democrat Scott McAdams if the Republican vote is split. It is one of several races in which the tea party's success in displacing traditional Republicans could work to Democrats' advantage. In Nevada, Reid might have been further down in the polls if he faced a challenger other than Angle, whom Democrats cast as too extreme. In one of the most widely watched races, Democrats are likely to hold onto Vice President Joe Biden's old Senate seat in Delaware, because Republicans nominated tea party-backed Christine O'Donnell instead of a more moderate candidate. O'Donnell's quirky comments in old TV interviews -- including an admission that she once dabbled in witchcraft -- made her the target of late-night comedians. Her attempts to defend herself haven't helped. In one TV ad, she declared, "I'm not a witch." Democrats had their own outrageous candidates. In the coal-mining state of West Virginia, Senate hopeful Gov. Joe Manchin took up a rifle in a TV ad to show voters his opposition to his own party's climate change legislation. Manchin was seen loading a hunting rifle and firing a shot into a target labeled "Cap and Trade Bill." Still, for all the attention given to outlandish candidates and the country's anti-establishment mood, most incumbents are likely to be reelected. And some of the new lawmakers will be very much part of the mainstream. Among the Republican Senate candidates favored to win are Rob Portman, a top trade official in the George W. Bush administration who is running in Ohio, and Dan Coats, a former senator and ambassador to Germany, in Indiana.
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