According to the polls, which were conducted by the right-leaning Harper Polling, Republicans hold leads in five of seven key U.S. Senate races. The other races are either tied or show room for growth from GOP candidates.

The automated surveys from Harper show Sens. Mark Begich (D-Alaska), Mark Pryor (D-Ark.) and Mary Landrieu (D-La.) trailing their Republican opponents. Republicans also lead open races with Democratic retirements in Montana and Michigan.

Republicans need to swing six seats — while holding onto their own seats — to take back control of the Senate. Doing so would give the GOP full control over both chambers of Congress.

Here's a breakdown of the key races polled by Harper:



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