The two other candidates were independents, namely housewife R. Malarvizhi, 51, and former lecturer Mohd Nor Yassin, 67.
Mohamad, who is the former menteri besar of Negeri Sembilan has held the seat since 2004.
On Tun Daim Zainuddin's recent statement that the PH government is expected to deliver the promises made in the 14th General Election in six months, Dr Mahathir said the government faces a lot of problems.
"We don't have the money. Money has been stolen. That's our problem. You want to do anything...the money is not available," he said.
Daim, who is chairman of the Council of Eminent Persons, said yesterday he expects the people to return to supporting the government once it delivers on its promises, especially by paying more attention to the economy.