Why do the Democrats always want to change the Electoral College after they lose?

2016 US presidential election results

The map above tells us that with the popular vote, blue areas would select our president, giving Hillary the win.

Silvio Canto, Jr  "It's not 2000, but it sort of sounds like it.  Senator Boxer, who is retiring, has introduced a bill to end the Electoral College, as we see in this report from CNN:

Democratic Sen. Barbara Boxer, who was an outspoken supporter of Hillary Clinton during the 2016 election, is set to introduce a Senate bill that aims to end the Electoral College.

Boxer announced in a statement on Tuesday that the bill, which she planned to introduce later Tuesday afternoon, would determine the winner of presidential elections by the outcome of the popular vote.

She cited President-elect Donald Trump's victory in the Electoral College despite Democratic nominee Hillary Clinton's apparent popular vote advantage.

"Of course, we don't really know who won the popular vote.  We have unofficial calculations based on state results.  There is no such thing as a certified final popular vote figure.

"Let's file this one under the "grandstanding" category, since Mrs. Boxer will be gone soon.   

"The real challenge is that such a change will actually require a constitutional amendment.  In other words, as we learned in our U.S. history high school class, such an amendment would require two-thirds majorities in the House and Senate and then in three quarters of states. 

"It is more likely that the Cubs will repeat as World Series champs than that we will see this change anytime soon.

"All of this uproar concerning the Electoral College raises two questions:

"First, why didn't Democrats vote for this when they had 60 votes in the Senate and a nice majority in the House, circa 2009-2010?  I guess they were busy pushing Obamacare through at any cost.

"Second, why didn't Senator Boxer call on Mrs. Clinton to say she would not accept the presidency unless it came with a popular vote?  I guess walking the walk is not something Democrats do!

"This "abolish" campaign will pass.

"After that, the Democrats may actually get down to understanding why they lost.  It's not hard at all.  Blue-collar workers would rather hear about jobs than global warming!"