He didn't win based on the system in place, which doesn't require a majority of voters, but a majority of electors, which is based entirely on the states. Want to win the White House, then win more states.
If the situation was reversed, would you still be complaining 14 years later that Bush was robbed if he won the popular vote and Gore won the electoral vote?
Since World War II, a shift of only a few thousand votes in one or two states would have elected the second-place candidate in 4 of the 15 presidential elections. Near misses are now frequently common. There have been 7 consecutive non-landslide presidential elections. 537 popular votes won Florida and the White House for Bush in 2000 despite Gore's lead of 537,179 popular votes nationwide. A shift of 60,000 voters in Ohio in 2004 would have defeated President Bush despite his nationwide lead of over 3 Million votes. In 2012, a shift of 214,733 popular votes in four states would have elected Mitt Romney, despite President Obamas nationwide lead of 4,966,945 votes.
With the current state-by-state winner-take-all system of awarding electoral votes (not mentioned in the U.S. Constitution, but later enacted by 48 states), it could only take winning a bare plurality of popular votes in only the 11 most populous states, containing 56% of the population of the United States, for a candidate to win the Presidency with a mere 23% of the nation's votes!
Most Americans think it is wrong for the candidate with the most popular votes to lose. We don't allow this in any other election in our representative republic.
In Gallup polls since 1944, only about 20% of the public has supported the current system of awarding all of a state's electoral votes to the presidential candidate who receives the most votes in each separate state (with about 70% opposed and about 10% undecided).
In 2011, 83% of Tennessee voters polled agreed that "The presidential candidate who gets the most votes always should be the winner."
Every political demographic group across the state favors changing to a system driven by the popular vote, the poll showed.
When Republicans were asked, "How should the President be elected, by who gets the most votes in all 50 states or by the current winner-takes-all system?" 73% of them favored the popular vote.
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Support for a national popular vote is strong among Republicans, Democrats, and Independent voters, as well as every demographic group in virtually every state surveyed in recent polls
By state (Electoral College votes), by political affiliation, support for a national popular vote in recent polls has been:
Alaska (3) -- 66% among (Republicans), 70% among Nonpartisan voters, 82% among Alaska Independent Party voters
Arkansas (6) -- 71% (R), 79% (Independents).
California (55) 61% (R), 74% (I)
Colorado (9) -- 56% (R), 70% (I).
Connecticut (7) -- 67% (R)
Delaware (3) -- 69% (R), 76% (I)
DC (3) -- 48% (R), 74% of (I)
Florida (29) -- 68% (R)
Idaho(4) - 75% (R)
Iowa (6) -- 63% (R)
Kentucky (8) -- 71% (R), 70% (I)
Maine (4) - 70% (R)
Massachusetts (11) -- 54% (R)
Michigan (16) -- 68% (R), 73% (I)
Minnesota (10) -- 69% (R)
Montana (3)- 67% (R)
Mississippi (6) -- 75% (R)
Nebraska (5) -- 70% (R)
Nevada (5) -- 66% (R)
New Hampshire (4) -- 57% (R), 69% (I)
New Mexico (5) -- 64% (R), 68% (I)
New York (29) - 66% (R), 78% Independence, 50% Conservative
North Carolina (15) -- 89% liberal (R), 62% moderate (R) , 70% conservative (R), 80% (I)
Ohio (18) -- 65% (R)
Oklahoma (7) -- 75% (R)
Oregon (7) -- 70% (R), 72% (I)
Pennsylvania (20) -- 68% (R), 76% (I)
Rhode Island (4) -- 71% liberal (R), 63% moderate (R), 35% conservative (R), 78% (I),
South Carolina (8) -- 64% (R)
South Dakota (3) -- 67% (R)
Tennessee (11) -- 73% (R)
Utah (6) -- 66% (R)
Vermont (3) -- 61% (R)
Virginia (13) -- 76% liberal (R), 63% moderate (R), 54% conservative (R)
Washington (12) -- 65% (R)
West Virginia (5) -- 75% (R)
Wisconsin (10) -- 63% (R), 67% (I)
Wyoming (3) 66% (R), 72% (I)
National Popular Vote -- Electoral college reform by direct election of the President