Midterm Elections 2014 Photos: The Pictures You Need to See

Governor Rick Perry of Texas leant a helping hand to fellow Republican Rick Scott at a rally Monday in advance of Tuesday's election, in which Scott faces a tough races against Republican-turned-Democrat Charlie Crist. The race is one of a handful of close governor's races contested Tuesday, when control of the U.S. Senate is up for grabs.

The race between Scott and Crist, the Sunshine State's last two governors, has been one of the strangest and most closely followed. Perry, a 2012 presidential candidate who's considering a run in 2016, was joined by another potential 2016 candidate, Governor Bobby Jindal of Louisiana, in campaigning for Scott.

In the Senate, Republicans need a net gain of six seats to take back Congress' upper chamber for the first time since 2006. Races in South Dakota, Montana and West Virginia are virtual shoo-ins for the GOP, which is also favored to pick up seats in Alaska, Louisiana, Arkansas, Iowa and Colorado. The Democrats could retain control of the chamber by fending off GOP challenges in some of those states and/or by picking up seats in Kansas, Georgia or Kentucky, in which Senate Minority Leader Mitch McConnell is hoping to fend off a challenge from Democratic Secretary of State Alison Lundergan Grimes.

As voters head to the polls, click through for a gallery of photos from throughout the campaign trail. (All photos by Getty Images.)