(CNN) California Sen. Kamala Harris plans to restructure her struggling presidential campaign, sources with knowledge of the staffing plans tell CNN.

The changes represent the clearest sign to date that Harris, who has seen her poll numbers consistently fall over the last three months, feels changes are needed to jumpstart her presidential bid and streamline an operation that one source said has been been bogged down by bureaucratic hurdles.

Harris will elevate Rohini Kosoglu, her Senate chief of staff, and senior adviser Laphonza Butler into senior leadership positions within the campaign, the sources said, splitting responsibilities for the day to day management of the operation.

Juan Rodriguez will remain Harris' campaign manager, but the addition of Kosoglu and elevation of Butler shifts some of the longtime Harris aide's responsibilities to different staffers.

Butler has already had a role on the campaign, leading one source to express skepticism that these changes will result in a markedly different strategy for the struggling campaign. Butler is expected to continue to play a significant role in the campaign's strategy in South Carolina, where a recent CNN poll indicated Harris has fallen to 3%

Read More