Reading his Wiki page -- he seems to champion issues that worked in the 20aughts. But nothing stands still.
Outside looking in I can see where he would be vulnerable.
.......................
http://en.wikipedia.org/wiki/John_Kline_(politician)
Political positions
Kline supported President Bush's plan to increase troop levels in Iraq in January, 2007.[5]
During Kline's 2008 bid for reelection he discussed his opposition to earmarks and his refusal to request them for his district.[6]
In 2006, Kline voted to maintain the legal definition of marriage as between one man and one woman.[7] He voted for the Violence Against Women Reauthorization Act of 2013.[8]
Kline has opposed restrictions on gun ownership.[9][10] He voted to repeal parts of the firearms ban for Washington, D.C.[11] He has described himself as "a collector of antique guns and a staunch supporter of the Second Amendment".[12]
Kline has stated, "Job creation is our nation's no. 1 challenge and Congress must make it our no. 1 priority."[13] Kline has spoken in support of education reform designed to encourage parent involvement and teacher accountability.[14] He is opposed to any tax increases and has stated that such strategies must be taken "off the table."[15] In remarks made to fellow representatives, Kline said, "we are watching a massive growth of government power, size, and spending, and I deem that unacceptable."[16]
In 2013 Kline proposed a bill that, among other adjustments, changed the rate on subsidized Stafford loans from 3.4% to 5.9%. The bill linked the rate of interest to the rate of US borrowing.[17]
Kline has voted to repeal the Affordable Care Act.[18] His campaign site states that "he opposed Obamacare because it is a seriously flawed law that was too big, was passed too fast, and does too much harm." [19]