According to Philip Bump...

...of the Washington Post, at least 11 Republicans are seriously considering a White House run in 2016:

1. Sen. Ted Cruz
2. Sen. Rand Paul
3. Rick Santorum
4. Gov. Rick Perry
5. Mike Huckabee
6. Gov. Bobby Jindal
7. Gov. Chris Christie
8. Gov. Scott Walker
9. Rep. Paul Ryan
10. Jeb Bush
11. Sen. Marco Rubio

No Mitt Romney?