The shift in party affiliation over the past seven years is absolutely incredible. In 2008, there were 35(!) states that were either solidly or leaning Democratic, five solid or leaning Republican and 10 judged as competitive. The following year there were 33 Democratic states, 12 competitive states and, still, five Republican ones.

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From 2008 to 2015, Democrats went from a 30-state lead to a six-state deficit when it comes to states solidly or leaning their way on party affiliation. That is simply stunning.

Gallup's findings are in keeping with what I think is the most under-told story of the Obama years: Republicans have made massive gains at virtually every level of government other than, of course, the White House.

Republicans have their largest House majority since World War II, having retaken the majority in the 2010 election. They hold a four-seat majority in the Senate, having seized control of the world's greatest deliberative body in the 2014 midterms.

At the state level, Republicans have 31 governorships -- almost two-thirds of all the governor's mansions in the country. Republicans are even more dominant at the state legislative level; the GOP holds total control over 30 of the 50 states' legislatures and has partial control in another eight states -- meaning that more than three-quarters of the country's state legislatures are controlled by the GOP.

Want another way to visualize just how much electoral ground Republicans have gained -- and Democrats have lost -- during the Obama presidency? Check out this chart via Republican lobbyist Bruce Mehlman. (Note: The chart does not include gains and losses in the 2015 elections.)

Striking, no?