With President Donald Trump in the White House and Republican majorities in both the House and Senate, 2017 will see Republicans looking to undo much of President Obama's legacy and advance longstanding policy priorities. Conversely, Democrats will spend much of the next two years playing defense, attempting to protect their achievements from the past eight years (in particular, the Affordable Care Act) and looking to draw stark comparisons with the Republicans in the lead up to the 2018 midterms.