The Presidential election is decided by who receives the most ELECTORAL votes. In order to win a state's electoral votes, you must win that state's popular vote.
This is how the numbers stack up for Hillary Clinton.
Needed to win: 270 electoral votes (EV).
She has 191 EV in the bag
She has another 69 very likely
Minnesota - 10
Michigan - 16
Wisconsin - 10
Virginia - 13
Pennsylvania - 20
191 + 69 - 260. Thus, she needs only 10 more EV to win.
Colorado - 9 EV - Clinton leading in polls
Ohio - 18 EV - Clinton slightly leading in polls
Florida - 29 -- Clinton leading and pulling away
North Carolina - 15 - Clinton slight lead
Nevada - 6 - Tied
New Hampshire - 4 - Clinton leading in polls
Iowa - 6 - Lead changes from day to day
Clinton can lose one or two of the likely states and win some of the battleground states and still win. If Trump loses Florida or NC or Colorado, he cannot win.