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Former Virginia Gov. Tim KaineTim KaineRyan assures GOP senators House will go to conference Senate Dems launch talkathon ahead of ObamaCare repeal vote 40 million fewer people expected to vote in 2018, study finds MORE (D) is Crossroads's main target: it's spending $1.55 million against him on two ads criticizing his tenure as governor as well as his support for a bipartisan deal to raise the debt ceiling last summer.

The conservative group is spending $1.33 million hitting Sen. Sherrod BrownSherrod BrownOvernight Finance: House passes spending bill with border wall funds | Ryan drops border tax idea | Russia sanctions bill goes to Trump's desk | Dems grill bank regulator picks Dems grill Trump bank regulator nominees Senate Dems launch talkathon ahead of ObamaCare repeal vote MORE (D-Ohio) on the economy, $770,000 to hit Sen. Claire McCaskillClaire McCaskillGOP single-payer amendment fails in Senate GOP senator forces Dems to vote on single payer Mattis rips Pentagon officials for M wasted on Afghanistan camouflage MORE (D-Mo.) on deficit spending, $680,000 attacking Rep. Shelley Berkley's (D-Nev.) ethics, $300,000 hitting Sen. Jon TesterJon TesterSenate heading for late night ahead of ObamaCare repeal showdown Overnight Healthcare: Four GOP senators threaten to block 'skinny' repeal | Healthcare groups blast skinny repeal | GOP single-payer amendment fails in Senate GOP single-payer amendment fails in Senate MORE (D-Mont.) on regulations and the deficit and $250,000 criticizing Rep. Tammy BaldwinTammy BaldwinSteel industry urges House panel to adopt 'Buy America' rules Major progressive group endorses Martha McSally challenger Vulnerable senators raise big money ahead of 2018 MORE (D-Wis.) on deficit spending.

The group, co-founded by top GOP strategist Karl Rove, does not have to disclose its donors and plans to spend upwards of $200 million, along with its sister organization American Crossroads, on the presidential and Senate elections this cycle.

The Democratic Senatorial Campaign Committee pushed back with a new web video slamming the group for pushing to "gut Social Security and Medicare," cut taxes for the wealthy and defend "big oil" subsidies.

This post was updated at 2:55 p.m.