The party fought the 1994 general election in alliance with Berlusconi's Forza Italia party within the Pole of Freedoms coalition.
One year after the European success, the NPSI presented itself in the House of Freedoms coalition for the regional elections of April 2005 .
In June 2007 the PLI reaffirmed its autonomy from the centre-right House of Freedoms coalition and de Luca was unanimously re-elected secretary.
FI and AN started to cooperate and were the pillars of the centre-right Pole of Good Government, Pole of Freedoms and House of Freedoms coalitions.
UDC leader Pier Ferdinando Casini opted for fresh elections instead, in line with the other leader of the centre-right House of Freedoms coalition.
In the 2006 general election the party was affiliated to The Union, the centre-left coalition led by Romano Prodi, and was decisive for the centre-left's victory over the centre-right House of Freedoms coalition.
It supports the House of Freedoms coalition.
On 13 May 2001, led by Francesco Rutelli, who ran in ticket with Piero Fassino, the coalition lost the general elections against Silvio Berlusconi and his centre-right House of Freedoms coalition.
At its founding congress, the NPSI decided to enter the then-new centre-right House of Freedoms coalition headed by the former friend of Bettino Craxi, Silvio Berlusconi.
It was the main member of the Pole of Freedoms, Pole for Freedoms and House of Freedoms coalitions, and is considered (by both insiders and outsiders) to have been very different from the other Italian political parties.