Matt Towery

There is growing optimism among Republicans that the GOP will take majority control of the Senate following the November elections. And yes, the likelihood is increasing that they could be right. But there's a wrinkle: It could be weeks or even months after the Nov. 4 elections before majority control of the Senate is decided.

RealClearPolitics is considered the gold standard for poll aggregation and elections predictions that display no bias or spin. According to RCP, Republicans are now favored to pick up seven additional seats in the Senate. That would give them 52 seats -- and control of both houses of Congress.

But among the states leaning or likely Republican in their Senate races are Louisiana and Georgia, both of which are highly susceptible to runoffs that would be held after the November general elections.

Consider Louisiana, where recent polls give an edge to Republican candidate U.S. Rep. Bill Cassidy over incumbent Democratic Sen. Mary Landrieu. Landrieu, whose famous family name is synonymous with Louisiana Democratic politics, is battling everything from Barack Obama's unpopularity to recent news stories noting that she lists her Washington, D.C., personal address for various official filings, rather than her parents' home in Louisiana, which she claims as her residence.

But most polls that show Cassidy leading in a tight battle fail to explain the implications of Louisiana's bizarre "Jungle Primary." A host of candidates ranging from other Democrats to several Republicans to a Libertarian are all listed on the ballot, with voters having to choose one among this all-inclusive field. If no candidate receives a majority of the vote, which is highly likely, then the two candidates who win the most votes head to a December runoff. That would reduce the Republicans to 51 seats -- and an effective majority of just one -- at least until after that Louisiana runoff.

Then there is Georgia's requirement that a candidate must win 51 percent plus one vote to win the state's open Senate seat in November. Without a GOP win in Georgia, Vice President Joe Biden could control the deciding vote in next year's Senate.

In Georgia, the polls are all over the place. Two polls show Republican David Perdue leading the race, while two others give Democrat Michelle Nunn the edge. And there is a Libertarian in the race. Georgia voters have been known to give Libertarian candidates a healthy 3 or 4 percent of the vote, and that has thrown past Senate contests into overtime.

In 1992, the late U.S. Sen. Paul Coverdell defeated then-incumbent Democratic Sen. Wyche Fowler in a runoff election. And as recently as 2008, the Libertarian candidate has forced a U.S. Senate race in Georgia into a runoff.

Matt Towery

Matt Towery is a pollster, attorney, businessman and former elected official. He served as campaign strategist for Congressional, Senate, and gubernatorial campaigns. His latest book is Newsvesting: Use News and Opinion to Grow Your Personal Wealth. Follow him on Twitter @MattTowery