Democrat Ann Kirkpatrick is trying to unseat McCain in a reliably red state.
Cornyn said he won't get involved in a primary fight next cycle.
Republicans and Democrats are battling for control of the Senate.
Rep. John Fleming is launching a new TV ad campaign.
Outside groups supporting Senate Republicans had their biggest fundraising month ever.
The video links Heck's votes on immigration and education to Donald Trump's proposals.
Democrats could be losing hope in defeating Sen. Rob Portman (R).
Rep. Patrick Murphy (D-Fla.) sent a pledge to Rubio Tuesday.
Timothy Cama 09/06/16 11:15 AM EDT
A major environmental group is launching a new $860,000 advertising campaign in Nevada to paint...
Sen. Ron Johnson is targeting his opponent's ties to Washington.