"To help Mitt Romney become the next president, Romney for President, Inc would like to use your email address — tap OK to let Pandora share this info," the message read.

Harris took a screenshot of the request and tweeted it with a one-word comment: #fail.

"Don't harass me on my email. Don't stalk me on the apps that I use. To me, that just crossed the line," Harris said in an interview with ProPublica.

Pandora's targeted email sharing pitch isn't new, but it's being offered to political advertisers for the first time this year, a company spokeswoman said. Both Democrats and Republicans, and both local and national campaigns have used the service to collect voter emails.

It's among the latest in a series of increasingly sophisticated tactics that campaigns are using to target narrow groups of voters online — from sending ads to Internet users who have visited a candidate's website, to creating a mobile app for campaign volunteers that marks the names and addresses of nearby voters on a Google map.

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