President Kibaki has rejected a controversial Bill that would have allowed MPs to change parties without losing their seats.
The President also gave politicians without university education, including at least 80 MPs, a reprieve when he rejected the Bill requiring that those seeking elective positions in the Senate and Parliament must have degrees.
President Kibaki explained that he could not sign the Statue Law Miscellaneous (Amendment) Bill because of pending court cases.
Earlier,
Prime Minister Raila Odinga and Vice-President Kalonzo Musyoka supported MPs in their fight to drop the degree requirement in the Elections Act which, they said, would marginalise a majority of Kenyans without university education.
However, the two opposed changes to the Political Parties Act that allowed party-hopping.
The President, who received the Bill on Monday morning after arriving from Brazil, held a quick meeting with Attorney General Githu Muigai and acting Head of Civil Service Francis Kimemia.
More than 80 MPs who could have been locked out by the degree requirement petitioned the President not to assent to the law. Kangundo MP Johnstone Muthama, one of those to have been affected, filed a case in court seeking to stop the President from signing the Bill.