Since 1980, the Republican party has been bedeviled by a persistent gender gap in presidential elections, as GOP nominees have struggled with female voters. But Rand Paul is facing an intensification of this phenomenon: He can't even win over Republican women. A recent CNN poll showed that the Kentucky senator is highly competitive among male primary voters; his 13 percent support put him neck-and-neck with top candidates like Scott Walker (13 percent), Marco Rubio (12 percent) and Jeb Bush (11 percent). Yet among Republican women, Paul's share of the likely vote collapses to 2 percent.