With Prime Minister Manmohan Singh hinting at a cabinet reshuffle, some DMK MPs have started lobbying for portfolios. DMK sources say the PMO has indicated that there will be changes in the portfolios of DMK ministers of state and has conveyed the message to party chief M Karunanidhi. The DMK has gained political space at the Centre with the Trinamool Congress deciding not to support UPA presidential candidate Pranab Mukherjee, who will step down as finance minister on June 26.