Who is the most formidable GOP presidential candidate?

“The Republican presidential candidates are getting in their last-minute prep before Thursday night’s debates. They will be separated into two events — the bottom seven in polls, as determined by a Fox News analysis, will debate at 5 p.m. And the top ten will take the primetime stage at 9 p.m.,” writes NPR’s Amita Kelly.

But for the first time in this campaign, we’ll see all the candidates debate serious issues, likely answering questions about national security, the economy, foreign policy — even the Planned Parenthood controversy that’s been in the news.

Today’s Question: Who is the most formidable GOP presidential candidate?