A misleading attack on a senatorial spouse’s investments - The Washington Post

Sen. Claire McCaskill's husband earns money from investments in low-income housing. A GOP attack ad uses big numbers to paint a misleading picture of swampy behavior. ....
https://www.washingtonpost.com/politics/2018/08/27/misleading-attack-senatorial-spouses-investments/

Russian Hackers’ New Target: a Vulnerable Democratic Senator - The Daily Beast:

Sen. Claire McCaskill is a top target for Republicans looking to grow their slim Senate majority in 2018. Turns out, Russia's "Fancy Bear" hackers are going after her staff, too. ....
https://www.thedailybeast.com/russian-hackers-new-target-a-vulnerable-democratic-senator

McCaskill on Trump's refusal to follow the law and impose Russia sanctions: A constitutional crisis

Claire McCaskill is one of the most conservative Democratic senators, the farthest thing from a liberal firebrand, and she's up for re-election this year in a solid red state. Which makes it all the more striking that she is speaking out so forcefully....
https://www.dailykos.com/story/2018/1/30/1737223/-McCaskill-on-Trump-s-refusal-to-follow-the-law-and-impose-Russia-sanctions-A-constitutional-crisis

The GOP's Extremist Agenda Is Making It Easy For Democrats To Stand Their Ground -- HuffPost

Sixteen years ago, a newly elected Republican president got a huge tax cut through Congress. And he did so with the support of a dozen Democratic senators, most of them politically vulnerable because they came from Republican-leaning states. The mass defection outraged Democratic leaders and grassroots activists, but none of them were really surprised. ....
https://www.huffingtonpost.com/entry/politically-vulnerable-democrats-trump_us_5a1878d0e4b0cee6c04fa04a