Jeb Bush is finally endorsing in the big GOP primary, but it's not the primary we've been waiting for. Sen. John McCain's (R-Ariz.) reelection campaign announced Wednesday that Bush will back him over former Rep. J.D. Hayworth (R-Ariz.). We'll continue to wait and see whether Bush feels the need to weigh into the GOP primary in his home state. At this point, though, he'd really just be piling on by endorsing Marco Rubio over Charlie Crist. Here's Bush's statement: "As we continue to face tough challenges both at home and abroad, America needs leaders like Senator John McCain in the...