For some time now, the speculation has been less "will Hillary Clinton run for president" and more "when will she announce she's running for president," but—assuming the reports are correct—the wait for an answer for the latter question is pretty much over, and
the answer is Sunday.
Clinton has already filmed her campaign video, a person close to the campaign said, which outlines the central themes of her second bid for the White House. The message is intended to send a signal to Democrats that she intends to aggressively fight for the party's presidential nomination.
Aggressively fight = not taking anything for granted = good idea. In line with that, Clinton will reportedly have a different style of campaign than in 2008:
Clinton is expected to trade big rallies for a series of smaller events with voters, as she seeks to reintroduce herself to voters. Her supporters have urged Clinton to take the time to meet voters one-on-one and build their trust. [...]
Campbell said she saw voters in Iowa light up when they connected with Clinton in coffee shops and in their homes, but those events were few and far between compared to large rallies and speeches. She said Clinton's empathetic side was not seen nearly enough during her 2008 campaign.
The undertone of the woman needing to work harder to be seen as warm and empathetic is irritating, but the fact is that diving straight into big rallies and big rallies only would set her apart in the Iowa-New Hampshire scene and could have a whiff of taking things for granted. In any case, campaigning hard for the Democratic nomination is exactly what Clinton should be doing, not necessarily because she faces a serious challenge there but because she needs to be defining herself and sharpening her campaign skills while the Republicans are busy with their primary.