The Texas senator endorsed Darryl Glenn.
Rubio has not officially announced whether he'll seek a second term.
Sen. Pat Toomey says he wants to break a current stalemate in the Senate.
The former Democratic senator's lead is within the margin of error.
Rubio faces a deadline next week to decide whether to enter the GOP primary for his seat.
Jolly says he'll decide whether to stay in the Senate race or run for the House.
Toomey's comments come as he's under pressure to back a Democratic proposal.
David Jolly says he'll drop out if Rubio decides to seek reelection.
Heck will face Catherine Cortez Masto in the race to replace retiring Harry Reid.
Katie McGinty is trying to unseat Sen. Pat Toomey (R-Pa.).