Batttle for control of the US Senate While the White House race is a toss-up and the Republicans are expected to hold the House of Representatives, the Democrats are hopeful of retaining control of the Senate. The race could come down to states like Massachusetts, which is seeing a fierce battle for the seat once held by the late Senator Ted Kennedy. Transcript EMMA ALBERICI, PRESENTER: While the White House race is a toss-up and the Republicans are expected to hold the House of Representatives, the Democrats are hopeful of retaining control of the senate. But the contest is still close, with Republicans potentially just three seats away from winning back the chamber. The race could come down to states like Massachusetts, which is seeing a fierce battle for the seat once held by the late senator Ted Kennedy. North America correspondent Craig McMurtrie travelled to Massachusetts for a closer look at the senate campaign. CRAIG MCMURTRIE, REPORTER: She's 63, a Harvard law professor who is aiming to the first woman to represent Massachusetts in the US Senate. ELIZABETH WARREN, DEMOCRATIC SENATE CANDIDATE: I'm running for the United States Senate because that's what girls do. CRAIG MCMURTRIE: In her first election she's also emerging as a national figure. (EXTRACT FROM ELIZABETH WARREN CAMPAIGN AD) NARRATOR: Elizabeth Warren, Massachusetts candidate for Senate. CRAIG MCMURTRIE: And an unlikely insurance policy for Democrats. Because if Barack Obama loses the presidency, her election could stop Republicans claiming a political trifecta, winning the White House