Some types of history have--usually--a low degree of politics involved, for example, the history of toys. Other types of history might have a high degree of politics, but the issues are mostly resolved, for example, the history of women's suffrage (most people agree that women have the right to vote and hold office).
And then there's New Deal history.
It is nearly impossible to do New Deal history and avoid politics because the mere mention of the "New Deal" raises the political ire of those who fear bogeyman "big government" and/or those do not believe in taxation for the general welfare. The New Deal is in direct conflict with today's political right, which, for example, blocked legislation that would have created a CCC-type program for unemployed veterans.
How we do New Deal history is an important question, because people who practice history often rely on public funds and/or charitable contributions. With respect to the latter, there are probably many charitable foundations who would refuse (or have refused) to award grants for anyone or anything pertaining to the New Deal, due to the progressive nature of many New Deal policies and programs. I have worked in the charitable foundation field, and I can tell you that politics definitely plays a role in the grant-making process. Also, non-profits have to be careful how they behave politically as there are limits imposed by the IRS in return for tax-exempt status (although these limits have been pushed beyond reason by some non-profit groups today. See, e.g., "Common Cause accuses conservative group of lobbying, seeks IRS probe").
Of course, each of us must make our own decision as to how we practice New Deal history--and there is certainly room and reason for different methods (and it would be pretty boring if we all thought and behaved exactly alike). As for me, I like the following statement from public historian Justin Champion, from the University of London:
"Good history is history that is honest - it is also history that is critical, informed, engaged and committed. It should expose tyranny, celebrate achievement, condemn crimes, explain prejudice, describe sacrifice, honour victims, commemorate the dead, but most importantly, provoke debate. Such history will try to preserve what is slipping from our grasp, and aim to recover what has been lost" (Justin Champion, "What Are Historians For?" Historical Research, vol. 81, no. 211, February 2008, p. 168).