Walston said it's unlikely that the second, shorter ban would be pursued if the six-year one is finalized first.
Nonetheless, Berlusconi's defense lawyer, Nicolo Ghedini, immediately pledged to appeal the two-year ban to the nation's highest criminal court.
For now, the three-time former premier and his center-right forces have pledged to continue their support for Premier Enrico Letta's cross-party government of long-time political foes on the left and the right. After triggering a government crisis by threatening to pull his party's backing of the governing coalition, Berlusconi did a last-minute about-face to support the government in a confidence vote.
Angelino Alfano, head of Berlusconi's party and deputy premier in Letta's government, said Berlusconi remained "strong and determined, as always" to relaunch the center-right.
The political bans would bar Berlusconi from participating in new elections for their length, but he could remain the titular head of his party without holding political office.
Berlusconi won't do jail for the tax fraud case. The four-year term has been reduced to one year under an amnesty for crimes committed before 2006, and Berlusconi reportedly has requested to perform community service instead of house arrest.
Berlusconi also faces a seven-year sentence and lifetime political ban after being convicted this summer of having paid a minor for sex and forcing officials to cover it up. He has two appeals.
A Naples court also is investigating him for allegedly bribing a lawmaker to bolt a previous center-left government under Romano Prodi.