Clinton allies pressured Dems on Benghazi

Politico reports:

Hillary Clinton’s world was so worried about a Republican investigation of the Benghazi attacks, they sent a message to House Democrats: We need backup.

House Minority Leader Nancy Pelosi (D-Calif.) publicly considered boycotting the panel, an idea that Clinton supporters feared would leave the potential 2016 candidate exposed to the enemy fire of House Republicans.
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So Clinton emissaries launched a back channel campaign, contacting several House Democratic lawmakers and aides to say they’d prefer Democrats participate, according to sources familiar with the conversations. Pelosi’s staff said they have not heard from Clinton’s camp.

Why is Hillary Clinton worried if there's nothing to hide?