Hugh Hewitt

The GOP's probability of taking over the United States Senate increased dramatically Wednesday with the entry of Rep. Cory Gardner into the race against incumbent Obamacare enthusiast Senator Mark Udall in Colorado.

Not one GOP seat is in danger of turning blue, despite all the yammering from Democrats about Kentucky and Georgia, where Mitch McConnell will coast and will Rep. Jack Kingston will emerge from a crowded Senate primary to win handily in the fall.

The biggest loser because of this move --other than Udall who is as tightly bound to Obamacare as President Obama himself-- is Arkansas Senator Mark Pryor, whose already sinking campaign is going to quickly find itself on the wrong side of the triage tent as Democratic strategists and donors realize that Re. Tom Cotton is unbeatable in the Razorback state.

Here's the list of Democratic seats which Republicans are positioned to take, from the mortal locks at the top down to the biggest but still possible reach at the bottom:

1. West Virginia: Rep. Shelley Moore Capito v. no one.

Jay Rockefeller quit after Capito got into the race. She will win, going away.

2. South Dakota: Former Governor Mike Rounds in South Dakota v. no one in South Dakota

This is a mortal lock for the popular Rounds.

3. Arkansas: Rep. Tom Cotton v. the hapless legacy senator Mark Pryor in Ark

Pryor won his seat because his dad held it for years. Now the combat veteran of Afghanistan and Iraq Tom Cotton has a lead and is building it day by day, as shrinking Pryor struggles to erase all his positive endorsements of Obamacare. Most recently he was for repealing the cuts to career military COLAs after he was for them.

Hugh Hewitt

Hugh Hewitt is host of a nationally syndicated radio talk show. Hugh Hewitt's new book is The War On The West.