Kamala Harris is going on the offensive on border security. It could keep Arizona blue and cut off Trump's path to victory.

• Vice President Harris is defining her positions on border security independent of President Biden.
• The Harris campaign is already running ads presenting the VP as a tough-on-crime prosecutor.
• Such an approach could keep Arizona blue and narrow Trump's path to return to the White House.

Last Friday, Vice President Kamala Harris and her running mate, Minnesota Gov. Tim Walz, greeted a crowd of over 15,000 supporters in Glendale, Arizona, a suburb of Phoenix.

For the Democratic faithful in the Grand Canyon State, the high level of enthusiasm for their party's presidential ticket is indicative of the political transformation that has occurred in state in recent years.