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Lady Gaga attends the Servicemembers Legal Defense Network Grassroots Rally in support of repealing 'Don't Ask, Don't Tell' on September 20, 2010 in Portland, ME.

Lady Gaga is making headlines by hosting a rally to support the repeal of Don’t Ask Don’t Tell. She has been vocal on this and other issues important to the gay community.

However, according to Maureen Callahan, author of 'Poker Face: The Rise and Rise of Lady Gaga,' the pop star’s affinity for gay culture started as a calculated marketing ploy.

Below is a YouTube video of Lady Gaga at yesterday's Maine rally to repeal Don't Ask, Don't Tell.