Bernie Sanders Can Beat Trump. Here’s the Math.

Most available evidence points in the direction of a popular vote and Electoral College victory.

Whatever you think about Bernie Sanders as a potential president, it is wrong to dismiss his chances of winning the office. Not only does most of the available empirical evidence show Mr. Sanders defeating President Trump in the national popular vote and in the critical Midwestern states that tipped the Electoral College in 2016, but his specific electoral strengths align with changes in the composition of the country’s population in ways that could actually make him a formidable foe for the president.

Almost all of the current polling data shows Mr. Sanders winning the national popular vote. In the most recent national polls testing Democratic candidates against Mr. Trump, Mr. Sanders beat him in every single one, with margins varying from 2 percent to 6 percent. This has been the case for nearly a year now, with Mr. Sanders outpolling the president in 67 of 72 head-to-head polls since March.

As 2016 proved when Hillary Clinton defeated Mr. Trump in the popular vote by nearly three million votes, however, the Electoral College is what matters most. There, Mr. Sanders also does well, outperforming Mr. Trump in polls of the pivotal battleground states of Michigan, Wisconsin and Pennsylvania. In the one poll showing significant Trump strength in Wisconsin (Quinnipiac), Mr. Sanders still fares the best of the Democratic contenders.

In addition to the polling data about how voters might act in the future, there is now the much more valuable information of actual voter behavior in the first three nominating contests, in Iowa, New Hampshire and Nevada. It is not just the fact that Mr. Sanders won the popular vote in all three states, it is how he won that portends hidden and underappreciated general election strength.