Kansas Gov. Sam Brownback has become the first sitting governor to endorse Sen. Marco Rubio of Florida for president. The Rubio campaign announced the endorsement Monday. "Just like Governor Brownback, Marco has consistently defended life, small government and free enterprise throughout his career in public service," Rubio midwest spokesman Jeremy Adler said in a statement. Kansas Republicans will caucus Mar. 5. Brownback, a Republican who once ran for president, endorsed then-Texas Gov. Rick Perry in 2011. Perry was a candidate for the 2016 GOP nomination but withdrew. "Marco Rubio has a proven track record of protecting life, defending religious liberty,...