There's no doubt the Republicans will still run the House after next week's election, but control of the Senate has both parties biting their nails. With Mitt Romney in the White House, his party would run two branches of government, bolstered by a sympathetic Supreme Court. If Barack Obama is re-elected, a Democratic Senate might be a buffer against the Congress, with a chance of making the Court less conservative. Razor-thin, increasingly nasty campaigns are being fought out over abortion, the role of government, party loyalty and bipartisanship. We hear about crucial races still too close to call.