Morning Digest: A trio of prominent candidates launch campaigns in these key Senate races

_{The Morning Digest is compiled by David Nir, Jeff Singer, and Stephen Wolf, with additional contributions from the Daily Kos Elections team.}

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Leading Off

● NV-Sen, MI-Sen, TX-Sen: Monday saw three prominent Senate candidates launch their bids in a trio of closely-watched contests. Army veteran Sam Brown gave the NRSC some welcome news when the Republican declared he'd challenge Democratic Sen. Jacky Rosen in Nevada, while actor Hill Harper, who is best known for his role on "The Good Doctor," announced that he'd seek the Democratic nomination for Michigan's open seat. Finally, Texas state Sen. Roland Gutierrez joined the Democratic primary to go up against GOP Sen. Ted Cruz in a state that Gutierrez's party is hoping to put in play.