New reports have surfaced (h/t CharlieSykes) that Paul Ryan is reconsidering his prior decision not to run for President:

As Wisconsin congressman Paul Ryan comes to a final decision about running for president, several top national conservatives are encouraging him to join the race. Ryan, who has been seriously but quietly considering a presidential bid for several months, is expected to decide on a run in the next two weeks

Perhaps you could tell me again about Ryan, now with the benefit of knowing who (most of) the Republican candidates are.