How about joining an effort to register Christians to vote? Seems to me that would do a lot more good than reciting the rosary.
Why not do both? The Rosary is a wonderful way to pray. On election night 2016 we went to Mass, adoration and prayed the rosary.
FYI, besides donating money since 2015 to the Trump campaigns, I also volunteer for President Trump. So, if you do not want to pray a rosary, please click on link to volunteer Election Day Team or copy and paste https://www.armyfortrump.com/forms/election-day-team