Tomorrow, May 18, there are three highly contested Democratic primaries for US Senate seats: Pennsylvania, Kentucky and Arkansas. In each race, the more left-leaning Democratic candidate is currently polling as the most electable.

Rand Paul has surged from a long-shot insurgent candidate to dominate the polls just days before the May 18 primary. According to a SurveyUSA poll, Paul has a 16-point lead over Trey Grayson (Paul 49 – Grayson 33). Senate Minority Leader Mitch McConnell is strongly backing Grayson, but being the party establishment’s favorite is not the charm in this election cycle.