Senate minority leader's retirement will mark end of a long career and open up a top seat.
A look at the 2016 GOP hopeful's legislative record, floor speeches and social media habits.
Conservative Texas firebrand says he hasn't ruled out a White House exploratory committee.
Likely GOP candidate says he didn't reverse his position against amnesty at a N.H. dinner.
The former president calls his son "the right man for the challenges ahead."
Bush said troops who lost their lives for Bergdahl "didn't get the same attention."
Jim Talent served on the Senate Armed Services Committee before losing in 2006.
Eric Holcomb is a former Indiana GOP chairman.
The GOP dissenters included hard-line conservatives and centrists.