The DA plans to concentrate in the next two weeks, which it has termed the "final push" phase, on uniting opposition voters.
Gibson told reporters in Johannesburg it was very important to have a strong opposition "to cut the government down to size".
Gibson said when the DA speaks of uniting the opposition, it is not wanting to gain the support of small parties, such as the Independent Democrats (ID) or the African Christian Democratic Party (ACDP).
"We want to unite opposition voters (to vote for the DA)".
The DA will also be reminding voters of its key manifesto pledges.
The DA has flighted about 3500 radio advertisements in this election campaign.
"We believe this is one of the largest advertising campaigns ever undertaken in South Africa", Gibson said.
"We are feeling very bullish ... because the campaign is going very well" he said.
"We have received excellent feed-back from voters during canvassing and we are well on course to meet the target of 25-3% of the vote we have set for ourselves and our coalition partners".
The DA will hold six large rallies across the country before the election on April 14, starting today in Port Elizabeth. – Sapa.
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