Americans are preparing to vote in mid-term elections which will decide who controls the Senate and pave the way for the 2016 race for the White House.
Polling booths open on Tuesday beginning 06:00 Eastern (11:00 GMT).
The Republicans, who already control the House of Representatives, need to gain just six seats to take the Senate.
Meanwhile the Democrats are battling to stay ahead as President Barack Obama’s approval ratings fall to the lowest they have been since he was elected.
Many analysts predict a Republican victory as Mr Obama’s popularity rate fails to climb much above 40%, despite recent improvements in the economy.
“This is a referendum on the president,” Republican senator and potential 2016 presidential candidate Rand Paul told NBC’s Meet the Press at the weekend.
But Democrats say their proven ability to rally their supporters ahead of elections could still give them the advantage.”Grab everybody you know, get them out to vote, don’t stay home, don’t let somebody else choose your future for you,” Mr Obama said during a campaign rally on Sunday.
Without the focus of a presidential campaign, the mid-terms – which are named because they fall in the middle of a presidential term – typically see a low voter turnout.
They also typically favour the party that is not in power.
President Barack Obama’s unpopularity is seen as a drag on the DemocratsThis year, a little over a third of the 100-seat Senate, all 435 members of the House of Representatives, 36 out of 50 state governors, and countless state and local offices are up for election.
The most closely watched action will be the races that will determine control of the upper chamber of Congress, the Senate.
Analysis: Jon Sopel, North America editor
I have spoken to Democrats and Republicans and they all said the same thing – they were sick of the partisan posturing, the gridlock, the inability to work together, the dysfunctional relationship between Congress and White House, between legislature and executive.
All of which begs the question – what difference will it make if the Republicans do take control of the Senate?
Some are predicting that it will be gridlock on steroids. In other words, just like before – only worse.
Others, who’ve clearly read Voltaire’s Candide and based their philosophy on the ever-optimistic Dr Pangloss, think we will go to the sunny uplands of politics.
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Source: BBC